Hammer



FIG. 1 is a perspective view of a hammer showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depicting surface ornamentation in FIGS. 1, 2, 4, 5 and 6 are included for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a hammer, as shown and described. 